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What is the maximum torque on a 150-turn circular coil of radius 0.7 cm that carries a current of 1.1 mA and resides in a uniform magnetic field of 0.15 T? Answer in units of N middot m
A spherical weather balloon is filled with hydrogen until its radius is 3.40 m. Its total mass including the instruments it carries is 10.0 kg. Find the buoyant force acting on the balloon
An astronomical telescope is designed with an overall magnification of 80x. The objective has a focal length of 98.0 cm. What should be the focal length of the eyepiece
A 1.20-kg block of wood sits at the edge of a table, 0.782 m above the floor. What horizontal distance does the block cover before hitting the ground
Some of the first "microscopes" were really single-lens magnifying glasses made by Leeuwenhoek. These devices had magnifications as high as 200.
A billiard ball moving at 5.80 m/s strikes a stationary ball of the same mass. find the struck ball's velocity after the collision
Two point charges and are held in place 4.50 apart. Another point charge -2.5 of mass 6 is initially located 3.00 from each of these charges and released from rest. You observe that the initial acceleration of -2.50 is 354 upward, parallel to the ..
A note played on a piano is 4719 Hz. If the speed of sound is 347 m/s, what is the wavelength of the note?
The image is located 3.5 cm from the mirror. (a) If the image is 4X larger than the object. Calculate the distance between the object and the mirror. (b) Calculate the focal length of the mirror.
Light in a vacuum is incident on a transparent glass slab. The angle of incidence is 38.8°. What is the index of refraction of the liquid
A zone plate is to be set up on an optical bench , where it will be used an an enlarging lens. find the focal length of the zone plate
A point on the rim of a 0.55 m diameter grinding wheel changes speed uniformly from 12 m/s to 20 m/s in 8.3 s. What is the average angular acceleration of the wheel
A 60.0 kg crate is slid up an inclined ramp 2m long onto a platform 1.6 m above the floor level. A 452 N force, parallel to the ramp, is needed to slide the crate up the ramp at a constant speed. How much work is done in sliding the crate up the r..
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